/*
* Copyright 2020 https://glumes.com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/


#include <iostream>
#include <vector>
using namespace std;

#include <unordered_map>

int main() {

    cout << "this is c++ playground for you ~~~\n";

    unordered_map<int,int> dd;

    auto i = dd.find(1);

    if (i == dd.end()){
        cout << "is null";
    }
    return 0;
}